If there is a Lease, then, as long as no other terms of the lease are violated, you may stay until the end of the lease. You may have a problem with this if there is no signed lease. However, if the landlord signed any of the leases with the other 3 roommates, then the Judge would consider this. If there is no lease, then the landlord has to give you 30 days written notice to quit. The landlord must use the required Michigan Court form for this to be legal.
Answered on Jul 28th, 2014 at 7:29 PM